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https://issues.apache.org/jira/browse/MAPREDUCE-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036541#comment-13036541
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Todd Lipcon commented on MAPREDUCE-2520:
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My guess is that someone at your organization has applied a local patch - that
code doesn't appear anywhere in any version of InputSampler I'm aware of (the
cloudera release you're referring to is primarily made up of patches backported
from the Apache trunk)
> InputSampler.RandomSampler only accepts Text keys
> -------------------------------------------------
>
> Key: MAPREDUCE-2520
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2520
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: William McNeill
> Priority: Minor
>
> I want to do a total sort on some data whose key type is Writable but not
> Text. I wrote an InputSampler.RandomSampler object following the example in
> the "Total Sort" section of Hadoop: The Definitive Guide. When I call
> InputSampler.writePartitionFile() I get a runtime class cast exception
> because my key type cannot be cast to Text. Specifically the issue seems to
> be the following section of InputSampler.getSample():
> K key = reader.getCurrentKey();
> ....
> Text keyCopy = WritableUtils.<Text>clone((Text)key,
> job.getConfiguration());
> You can only use a RandomSampler on data with Text keys despite the fact that
> InputSampler takes <Key, Value> generic parameters.
> InputSampler.getSample() should be changed to cast the key to type K instead
> of type Text.
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